evolution of the horse Essay

evolution of the horse Essay

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evolution of the horse

For many people, the horse family remains the classic example of evolution.

As more and more horse fossils have been found, some ideas about horse
evolution have changed, but the horse family remains a good example of
evolution. In fact, we now have enough fossils of enough species in enough
genera to examine details of evolutionary change.

Evolution does not occur in a straight line toward a goal, like a ladder; rather,
evolution is like a branching bush, with no predetermined goal. Horse
species were constantly branching off the evolutionary tree and evolving
along various unrelated routes. There’s no discernable straight line of horse
evolution. Many horse species were usually present at the same time, with
various numbers of toes, and adapted to various diets. In other words, horse
evolution had no inherent direction. We only have the impression of straight
line evolution because only one genus happens to still be alive, which
deceives some people into thinking that the one genus was somehow the
target of all the evolution. Instead, that one genus is merely the last surviving
branch of a once mighty and sprawling bush.

Tracing a line of descent from Hyracotherium to Equus reveals several
apparent trends: reduction of toe number, increase in size of cheek teeth,
lengthening of the face, and increase in body size. But these trends are not
seen in all of the horse lines. On the whole, horses got larger, bu...

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evolution of the horse Essay

- evolution of the horse For many people, the horse family remains the classic example of evolution. As more and more horse fossils have been found, some ideas about horse evolution have changed, but the horse family remains a good example of evolution. In fact, we now have enough fossils of enough species in enough genera to examine details of evolutionary change. Evolution does not occur in a straight line toward a goal, like a ladder; rather, evolution is like a branching bush, with no predetermined goal....   [tags: essays papers]

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